# Write the common difference of an A.P. whose nth term is an = 3n + 7.

If an = 3n + 7

Then a1 = 3 (1) + 7 = 10

a2 = 3(2) + 7 = 13

a3 = 3(3) + 7 = 16

d= common difference = an – a n–1

= a3 – a2

= 16 – 13 = 3

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